惠水县2018年冬季连阴雨天气过程分析
Analysis of the Continuous rainy Weather Process in the Winter of 2018 in Huishui County

本文利用欧洲中心0.25？ × 0.25？的月平均再分析资料和惠水县国家基本气象站的日观测数据对2018年冬季惠水县连阴雨天气过程做简要探讨和分析，结果表明：2018年冬季500 hPa、700 hPa和850 hPa的环流形势和影响系统与气候态的冬季相比500 hPa上的弱脊，浅槽波动，副高强度都更为明显；700 hPa和850 hPa上水汽条件更加充沛。具体表现在：2018年冬季500 hPa欧亚环流形势稳定，西太平洋副热带高压偏西偏强，中亚地区低槽波动活跃；低空暖湿气流沿副高西侧持续不断向长江中下游以南地区输送，云贵高原上静止锋稳定存在。700 hPa上，贵州范围内锋面逆温与相对湿度高湿密集区的配置是造成2018年冬季惠水县低温连阴雨的影响因素之一。惠水县此次低温连阴雨天气过程持续时间长，过程累计总降雨量与历史同期相比显著偏多，总日照时数比历史同期明显偏少，严重影响了惠水县越冬作物生长发育进程。
This paper uses the monthly average reanalysis data of 0.25？ × 0.25？ in the European Center and the daily observation data of the National Basic Weather Station of Huishui County to briefly discuss and analyze the continuous rainy weather process in Huishui County in the winter of 2018, the result shows: The circulation situation and influence system of 500 hPa, 700 hPa and 850 hPa in the winter of 2018 are more obvious than those of the climatic winter. The weak ridges, shallow troughs and subtropical highs on 500 hPa are more obvious. 700 hPa and 850 hPa water vapor conditions are more abundant. Specifically in: The 500 hPa Eurasian circulation in the winter of 2018 is stable, Western Pacific Subtropical High is stronger to the west, low trough fluctuations in Central Asia are active; the low-altitude warm and humid air flows continuously along the west side of the subtropical high to the south of the middle and lower reaches of the Yangtze River. The stationary front exists stably on the Yunnan-Guizhou Plateau. 700 hPa, the configuration of the frontal temperature inversion and relative humidity and high humidity dense areas within Guizhou is one of the influ-encing factors that caused the low temperature and continuous rain in Huishui County in the winter of 2018. The low temperature and continuous rainy weather in Huishui County lasted for a long time. The cumulative total rainfall of the process is significantly higher than that of the historical period. The total sunshine hours are significantly less than the same period in history, severely affected the growth and development of overwintering crops in Huishui County.